So the TL;DR version is: you can make scales out of the position of black keys on keyboards.

So now I'm talking about The Mode of Kallisti. Short video explanation here.

Okay, So figuring out what notes are in the mode of Kallisti is fairly easy. Take your root note (say, C) and the notes on either side of it (B, C#/Db) and the Tritone (6 steps away, it's opposite, #F) are not in the scale. Everything else is.